fallocate: add insert range support

Based on patch 83cc932d7412
("fallocate: introduce an option -c to support COLLAPSE_RANGE")

This patch includes FALLOC_FL_INSERT_RANGE flag
added to Linux kernel v4.1

Thanks to Pádraig Brady for insert range definition

Signed-off-by: Fabian Frederick <fabf@skynet.be>
2 files changed